39640145 has 8 divisors (see below), whose sum is σ = 47872104. Its totient is φ = 31509504.

The previous prime is 39640127. The next prime is 39640151. The reversal of 39640145 is 54104693.

39640145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 529 + 39639616 = 23^2 + 6296^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 39640145 - 2⁸ = 39639889 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24464 + ... + 26033.

It is an arithmetic number, because the mean of its divisors is an integer number (5984013).

Almost surely, 2^39640145 is an apocalyptic number.

It is an amenable number.

39640145 is a deficient number, since it is larger than the sum of its proper divisors (8231959).

39640145 is a wasteful number, since it uses less digits than its factorization.

39640145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50659.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 39640145 is about 6296.0420106603. The cubic root of 39640145 is about 340.9665260698.

The spelling of 39640145 in words is "thirty-nine million, six hundred forty thousand, one hundred forty-five".